Carrier doping of Bi${}_2$Se${}_3$ surface by chemical adsorption -- a DFT study

Cheng Fan, Kazuyuki Sakamoto, Peter Krüger

Bi${}_2$Se${}_3$ is one of the most promising topological insulators, but it suffers from intrinsic n-doping due to Se-vacancies, which shifts the Fermi level into the bulk conduction…